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Hispaniola

(Encyclopedia) Hispaniola hspny´l, Span. Españolaspäny´lä, second largest island of the West Indies, 29,530 sq mi (76,483 sq km), between Cuba and Puerto Rico. Haiti occupies the western third…

Hiss, Alger

(Encyclopedia) Hiss, Alger l´jr, 1904–96, American public official, b. Baltimore. After serving (1929–30) as secretary to Justice Oliver Wendell Holmes, Hiss practiced law in Boston and New York…

Hissar

(Encyclopedia) Hissar: see Hisar, India.

Hissarlik

(Encyclopedia) Hissarlik: see Troy, ancient city.

histamine

(Encyclopedia) histamine hs´tmn, organic compound derived in the body from the amino acid histidine by the removal of a carboxyl group (COOH). Although found in many plant and animal tissues,…

histidine

(Encyclopedia) histidine hs´tdn, organic compound, one of the 22 &agr;-amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian protein. Histidine is the…

histology

(Encyclopedia) histology hstl´j, study of the groups of specialized cells called tissues that are found in most multicellular plants and animals. Histologists study the organization of tissues at…

histone

(Encyclopedia) histone hs´tn, any of a class of protein molecules found in the chromosomes of eukaryotic cells. They complex with the DNA (see nucleic acid) and pack the DNA into tight masses of…